| 单词 | camber-beam | 
| 释义 | > as lemmascamber-beamcamber-beam: one with its upper surface curving downward on both sides from the middle.  collar-beam: a beam used to join together roof-rafters above the base of the roof, acting either as a tie or a strut.  dragon-beam: a short piece of timber lying diagonally with the wall plates at the angles of the roof, for receiving the heel of the hip rafter.  hammer-beam: a beam acting as a tie, but not extending across the whole span of the roof.  tie-beam: the beam which connects the bottom of a pair of principal rafters, and prevents them from thrusting out the walls.extracted from beamn.1 camber-beam   camber-beam  n. (see quots.) ΘΚΠ society > inhabiting and dwelling > inhabited place > a building > parts of building > framework of building > 			[noun]		 > roof-beam pan1284 roof-tree1321 wiverc1325 sile1338 wind-beam1374 bindbalkc1425 trave1432 purlin1439 side-waver1451 wind-balk1532 roof beam1551 post1567 crock1570 spercil1570 collar-beam1659 camber1679 top-beam1679 camber-beam1721 jack rafter1736 hammer-beam1823 tie-beam1823 spar-piece1842 viga1844 collar1858 spanner1862 cruck1898 1721    N. Bailey Universal Etymol. Eng. Dict.  				Camber-beam..is a Beam cut hollow or arching in the middle. 1823    P. Nicholson New Pract. Builder 129.  				 < as lemmas | 
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